Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/317305
Type: TESE
Title: Estudo comparativo em linhagens de Enterobacter cloacae isoladas de plantas e de casos clinico-hospitalares
Author: Rodrigues Neto, Julio
Advisor: Yano, Tomomasa, 1941-
Abstract: Resumo: Vinte linhagens de Enterobacter cloacae entre isolados de plantas e de origem clínico-hospitalar foram estudadas por meio de serologia, eletroforese de proteínas totais e RAPD. Teste de patogenicidade em bulbos de cebola também foi aplicado. Com a finalidade de se comparar as linhagens, também foram incluídas neste estudo as culturas tipo de Enterobacter dissolvens e Enterobacter nimipressuralis. Serologicamente, foi verificado que as linhagens oriundas de plantas são similares, com exceção de uma linhagem, e puderam ser diferenciadas das linhagens clínicas. Entretanto, quando comparadas por meio de eletroforese de proteínas totais, as linhagens de E. cloacae se mostraram mais homogêneas, embora com diferenças nos padrões de proteínas. Dentre as técnicas empregadas RAPD foi a mais sensível, discriminando três grupos genômicos, onde as linhagens vegetais aparecem homogêneas e são claramente distinguidas, enquanto que as linhagens clínicas foram distribuídas em vários sub-grupos, devido a sua heterogeneidade. A cultura tipo de E. cloacae aparece não relacionada com a maioria das linhagens, o mesmo ocorrendo com E. nimipressuralis. Nos testes de patogenicidade em bulbos de cebola, o grupo das linhagens clínicas também mostrou capacidade fitpatogênica, induzindo colapso interno das escamas, o mesmo ocorrendo com E. dissolvens e E. nimipressuralis. Com base nos resultados obtidos, verificou-se que E. cloacae isoladas de vegetais, embora oriundas de hospedeiros e regiões geográficas distintas, são estreitamente relacionadas. A hipótese de que vegetais contaminados atuem como "vetores" de E. cloacae, introduzindo-a no ambiente hospitalar, deve ser considerada

Abstract: Twenty strains of Enterobacter cloacae isolated from plants and clinical origin including the type strain were studied by serology, electrophoresis and RAPD analysis. A pathogenicity test on onion bulbs were also performed with vegetables and clinical isolates. In addition, the type strains of two related species Enterobacter dissolvens and Enterobacter nimipressuralis were also included for comparative purposes. Serologically the strains coming from plants were found to be very similar and could be differentiated from clinical isolates. However E. cloacae strains were more homogeneous when compared by cell protein electrophoresis, although the protein patterns revealed some differences. RAPD was the most discriminatory method employed and three genomic groups were distinguished among cultures. The E. cloacae strains isolated from plants were homogeneous and the strains coming from clinical were distributed in subgroup levels on the two remaining groups. A clear cut differentiation between the plant and clinical strains were evident but it should be noted, however, that clinical strains were also heterogeneous and the type strain of E. cloacae appear to be non related to others as well as the strain of E. nimipressuralis. In the pathogenicity tests on onion bulbs, like the plant strains the group comprising c1inical origin showed a phytopathogenic capability, induzing a colapse of the inner scales. E. dissolvens and E. nimipressuralis strains also induced symptoms on onion bulbs. On the basis of the results obtained in this study, it was verified that E. cloacae strains from plants showed close similarity although coming from different hosts and geographical origin and it is suggested that vegetables could act as a "vector" of E. cloacae in the hospital environment
Subject: Infecção hospitalar
Epidemiologia
Language: Português
Editor: [s.n.]
Date Issue: 1997
Appears in Collections:IB - Tese e Dissertação

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